Mock paper 1 questions Flashcards
Why is it better to use a cable with low resistance than high resistance?
- more efficient
- less energy dissipated
What happens to the current if you increase the the temperature of the resistor?
- current increases
- as resistance decreases
Explain why the temperature of the heating element increased?
- electrons collide with particles in heating element
- KE of particles increase
Suggest why the line didn’t go through the origin?
-heat element took time to heat up
Why did the results give a non linear pattern?
- as mass of water In kettle increases
- energy transfer to surroundings decreases
Explain why the count rate was less than the activity of the sample?
- radiation spreads in all directions
- only some of gamma radiation passing into tube is detected
radiation- explain why the teacher stood as far away from the apparatus as possible
- reduce irradiation
- reduce amount of radiation received
As person moves down zip wire increase in kinetic energy is less than decrease in gpe…why?
- friction
- thermal energy transferred to surroundings
Explain how motion of air molecules caused pressure in container to change as temp decreased?
- KE of air molecules decreases
- fewer collisions with container walls
- pressure decreases
liquid gas solid
liquid gas solid
What is the total resistance of the circuit?
Less than 20
Explain your answer?
- total resistance of parallel section is less than 10
- added to 10ohm resistor in series
Explain how pf across resistor will change when switch is closed
- decreases pd becomes 0
- there is a short circuit across resistor
Explain how pd across lamp will change when switch is clsoed?
current and pd increases
gIVE ONE VARIABLE STUDENT SHOULD HAVE CONTROLLED?
Starting temp of water
Half life question
1/2 to the power of 5
1:32
Second half life question
-4.8 x 10 to the power of 3 over 94
= 5.1 x 10 to the 21
Different people have different speeds at the end of the zip wire why?
- different people are affected differently by air resistance
- as SA varies
lAST QUESTION
- energy given to water = m x slh
- since Bunsen burner = energy/time
- power= ml/t
ohmic conductor
- in oc current and potential difference are directly proportional
- as resistance is constant
- occurs from 0-2V
why not use maximum power?
- conserve fuel reserves
- reduce unnecessary environmental impact
As speed increases efficiency increases
likely to be maximum efficiency
how can uncharged object become charged?
- negatively charged
- electrons transferred
- from the object
Which radiation
Beta
neutron has decayed into a proton
explain how energy released by chain reaction is affected by moving control rods
- lowering control rods increases absorption of neutrons
- energy released decrease
